Hydraulics trouble shooting guide advanced fluid systems. Students will start with an overview of hydraulic principles and progresses through hydraulic system components including pumps, valves, cylinders, motors, rotary actuators, accumulators and filters with emphasis placed. Hydraulic pumps fixed displacement pumps the gpm of the fixed displacement pump can not be varied. When working on a specific machine, refer to a machines technical manual for more information. Because of this, the following points should be considered. Dec 17, 2011 this results in a much weaker shaft that is almost twice as susceptible to deflection in the event of a hydraulic upset condition such as that which may occur close to the shutoff point on the curve.
This can happen on a new system after only a few hours operation as well as on a system which has been in service for a long time. Condensed table causes of trouble and their effects in hydraulic installations. We have a hydraulic system that operates two cylinders. Do not use teflon tape on pipe thread fittings pump is hot. Unlike most other hydraulic technologies, the parker vane pump design is hydraulically balanced. Hydraulics troubleshooting january 2019 hydraulic power units when there is a problem with a kti power unit. Also, the pump assembly has a large canister attached for the hydraulic fluid filter. Troubleshooting tips for hydraulic systems womack machine. Hydraulic pump troubleshooting guide no oil flow from pump.
Changing the filter regularly is a must to maintain optimum power in the hydraulic circuit. Dc power unit troubleshooting guide kti hydraulics, inc. If you do see the pump heat up instantly you just found your culprit, and it took you but a couple of minutes. The difference in elevation or pressure between the inlet water level and the effluent water level.
Table of contents overview 1 pump disassembly 2 control disassembly reassembly 7 pump reassembly adjustment procedures dr control 19. Dec 15, 2014 pat clark of lifting gear hire demonstrates a few troubleshooting solutions for your hydraulic cylinders and pumps in the hopes of ensuring a successful and productive project. A hydraulic pump utilizes the twoposition, threeway solenoid valve to control the pump outlet pressure shown in figure 2. Disclaimer this service manual has been prepared by parker hannifin for reference and use by mechanics who have been trained to repair and service hydraulic pumps and systems on commercial and noncommercial equipment applications. For example, an inadequate size filter on the inlet of a pump can cause cavitation and subsequent damage to the pump. Nov 18, 2014 this is the first of a special set of videos we have created on hydraulic systems and troubleshooting. Use a soft brass rod and hammer to tap the ball and springs. Condition likely cause correction muncie power products. Figure 39 illustrates a vane pump with a circular interior. However, this occurs best at the manufacturers recommended capacity. The pumps will stop automatically if the level drops to the shutdown level.
Working mechanism of a centrifugal pump a centrifugal pump is one of the simplest pieces of equipment in any process plant. Centrifugal pump problems 5 overview of pump problems typically found on centrifugal pumps. Each component in the system must be compatible with and form an integral part of the system. Air usually enters the hydraulic system through the pump s inlet. Hydraulic line from proportional valve to pump control port 4. If in doubt, always refer to the original equipment manufacturer. Pressure pump and related control components components on top of press dbet card in control box legend 1. The grader hydraulic system the hydraulic pump is driven at the flywheel end of the engine. If you dont detect it, theres a good chance the problem is elsewhere. If the hydraulic pump is the heart of the system, then the hydraulic oil is the life blood and the functions of hydraulic oil can be summarized. The arrangement is similar to shell chambers in a revolver. Other supplementary information on specific components such as pumps, cylinders, and valves will be found in other data sheet issues, and is referenced in the.
Take temperature readings at the pump, pump case, and various valves to identify a noticeable temperature rise possible internal leakage. Logical troubleshooting in hydraulic systems eaton. Logical troubleshooting in hydraulic systems is intended as a guide to systematic fault findings in a hydraulic system. This data sheet describes a stepbystep checkout procedure for hydraulic systems which have previously been working satisfactorily but which have developed trouble, usually over a 24hour working period, which renders them. Psi setting could be too low internal issues with pump very rare 2. Plug the pump ports and cover the open hydraulic lines immediately after theyre disconnected. A system curve is a graphical representation of the relationship between flow and head in a fixed hydraulic network. Troubleshooting hydraulic system problems troubleshooting. Use compressed air to pressurize reservoir while running pump or fill inlet hose with oil from the pump end. Rachel will help you take the guesswork out of your ford 8n, 9n or 2n hydraulic system. An effective pump troubleshooting tool will always begin with the question when did this start.
Kubota bx23 hydraulic cylinder piston repair front loader. Hydraulic gear pump and motor failure analysis and repair. Minor seat imperfections may be corrected by reseat use repair kit 50034349 to replace all oring seals, balls ing. Cylinders are energized by a 12 volt dc high pressure hydraulic pump through electrically. Troubleshooting hydraulic pumps al smiley, gpm hydraulic consulting when a hydraulic issue occurs, the pump usually is one of the first components changed. We look forward to serving you with your hydraulic needs. Vickers systems to the extent permitted by law accept no liability for loss or damage suffered as a result of the use of this guide.
The hydraulic hand pump manual has been updated to include cuttingedge imaging technology by ngrain. This pump troubleshooting guide can help with your common pumping concerns. If the valve discharges to tank, disconnect the tank line and connect a hose from the valve, feeding into a bucket. Troubleshooting and preventive maintenance of hydraulic. The machine in question had a complex hydraulic system, the heart of which comprised two engines driving 10 pumps.
We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of. Preface this is a discussion of basic hydraulics which can help with the diagnostics and repair of hwh hydraulic leveling and room extension systems. Listen for distinctive cavitation sound from pump and verify all hydraulic hoses. Symptoms of common hydraulic problems and their root causes. System test for pressure relief valves system test for sequence valves. Clean the port areas thoroughly before disconnecting the hydraulic lines. Follow these steps to determine exactly where your problem lies.
Last year i received a troubleshooting call from a paper mill in wisconsin where one of the pressure compensating pumps had been changed because it would not build and maintain pressure. To prevent personal injury, only qualified personnel shall perform inspections and repairs to this airhydraulic pump. Images in this pdf files displaying an ngrain logo are interactive. The table below lists the most common problems press operators experience, their causes and. The process of troubleshooting should always begin with checking and eliminating the easy things first. Step 1 pump inlet strainer probably the field trouble encountered more often is cavitation of the hydraulic pump inlet caused by dirt buildup on the inlet strainer. Buchermonarch pump and cylinder troubleshooting brimar dump trailers pump wont lift. Item c, operate pump for a few seconds until fluid comes out of port, replace relief valve torque to 22nm and retry unit air being introduced in system if air is being introduced in the system, the gear pump might have some priming problems. Many of the failures in a hydraulic system show similar symptoms. Parts and repair information hydraulic supply company. The pump is arguably the heart of almost every hydraulic system and, as such, has traditionally been blamed for almost every operating problem.
Worn pump, valve, motor, cylinder or other component. Hydraulic fluid and temperature recommendations for industrial machinery 16. Please read and observe the hydraulic product safety page before proceeding further. Symptoms of common hydraulic problems and their root causes brendan casey. Troubleshooting 767 hydraulic hand pump troubleshooting problem possible cause probable remedy oil leak at coupler. There are many different forms of hydraulic presses but the most simple kind is the hand operated hframe press. View and download parker p2 series service manual online. These stepbystep procedures should help you locate and remedy. The tank, valves and cylinders were cleaned and a replacement pump installed. It is expected that all troubleshooting and testing will be performed by a qualified hydraulic technician.
Troubleshooting tips for hydraulic systems download data sheet this data sheet describes a stepbystep checkout procedure for hydraulic systems which have previously been working satisfactorily but which have developed trouble, usually over a 24hour working period, which renders them inoperative. A predominant condition requiring troubleshooting expertise in centrifugal pumps is referred to as cavitation. Vanetype hydraulic pumps generally have circularly or elliptically shaped interiors and flat end plates. For this reason, it is important to make sure pump intake lines are in good condition and all clamps and fittings are tight. When a hydraulic system has problems, it is common practice to first look at the pump. Hydraulic system troubleshooting pellerin milnor corporation. How to troubleshoot the inlet side of a hydraulic pump 2. Hydraulic system troubleshooting advanced fluid systems. The pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a sudden or gradual failure in the system. Our troubleshooting hydraulic pumps and accumulators manual, which has become the standard of excellence in hundreds of mills across the united states and canada.
Frontend loader hydraulics troubleshooting it still runs. Flow from the pump is directed to the flow regulator. Typically, the cleaner the hydraulic system is maintained, the. Troubleshooting hydraulic systems and components workshop 40 hours the troubleshooting hydraulic systems and components workshop for mobile and industrial hydraulics covers the following topics. Basic hydraulic troubleshooting learning system aidex. Hydraulic systems may be very complex, but every system, no matter how basic, must contain a reservoir, a pump, various valves to control oil flow, direction and. Even though these presses are extremely durable, there are a few common problems that come up with every day use. Yet, most of the problems encountered in all of these systems are often traced down to a few basic issues. Having taken a measurement at a certain point in a system, it is obviously.
Put your hand on valve to feel or listen for leakage. Troubleshooting tips for hydraulic pumps download data sheet the pump is probably the component most subject to wear in a hydraulic system, and the one most likely to cause a sudden or gradual failure in the system. This speed oil flow can be increased or decreased by using a pump of higher or. In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. In fact, the cylinders may stall under light loads or may not move at all. Hydraulic system troubleshooting pellerin milnor corporation figure 35. The benefits of this approach are clearly illustrated by a recent troubleshooting situation.
The following lists information when troubleshooting relief, pressurereducing, pressure sequence, and unloading valves. The first section of this school, introduction to hydraulics is a more indepth study of general hydraulics and should be studied before continuing in this section. Pump fault mcc or standby pump fault mcc identified by pump motor output gives alarm to control desk if that pump is not running. If you are facing problems in working conditions, the troubleshooting tables for vane pumps and vane motors in. Vickers systems to the extent permitted by law accept no. Use only those repair parts called out in the parts list in this document. The gpm of the fixed displacement pump can not be varied. Hydraulic trouble shooting hydraulic systems can be very simple, such as a hand pump pumping up a small hydraulic jack, or very complex, with several pumps, complex valving, accumulators, and many cylinders and other actuators. The article has been written keeping in mind the level and interests of students and the beginners in operation.
The life expectancy of all hydraulic components is directly related to the cleanliness of the hydraulic system that it operates within. Day one of this hydraulic repair and troubleshooting course focuses on examining what hydraulic systems are and how they work. Session 1 will include components of a hydraulic system, and the fundamental elements that. Troubleshooting tips for hydraulic pumps womack machine. The hydraulic slideout system is a fixed displacement system, using double acting hydraulic cylinders to open and close a room assembly built into the travel trailer or motor home. A slotted rotor is fixed to a shaft that enters the pumphousing cavity through one of its end plates. Thank you for visiting gpm hydraulic consulting webpage. Understanding the cause and remedy of your pump issue, along with some simple preventative steps, you can get back on track with smooth hydraulic metering pump.
Before starting the hydraulic pump, fill the pump with hydraulic oil. Please read this operating manual carefully and follow the instructions provided. Chapter 7 hydraulic system troubleshooting general the following troubleshooting information is provided as a general guide to identify, locate and correct problems that may be experienced with the hydraulic system of this crane. Common conditions requiring pump troubleshooting expertise are cavitation, hydraulic imbalance, undersized shafts, and mechanical seal failure.
Formulas include those commonly used for cylinders, hydraulic pumps and motors, and vehicle sizing. Hydraulic pumps must be completely sealed and leak free. Running volutestyle pumps at a lower capacity than the manufacturer recommends can put lateral stress on the shaft of the pump, increasing wearandtear on the seals and bearings, and on the shaft itself. Go hydraulics is a complete hydraulics service centre specializing in repairing and reconstruction of hydraulic components, such as. Pumps which may be vane, gear, or piston types are used in hydraulic systems to produce sufficient flow to obtain the speed required from cylinders or motors. System tests for piston pumps when a hydraulic system has problems, it is common practice to first look at the pump. Gradual or sudden loss of pressure or flow resulting in a loss of power is common in hydraulic system failure. The axial piston pump has a series of cylinders typically 7 or 9 mounted parallel to the axis of rotation. The new pump is delivering a maximum pressure of 1,000 psi and appears to be creating heat. The maintenance staff recently reported that the pump pistontype had failed for reasons unknown at this time. Professional instruction from our consultants who have solved numerous hydraulic problems through handson experience.
Pump running but not lifting charge the battery check for loose battery cableswires and verify the ground is good is the trailer overloaded. This speed oil flow can be increased or decreased by using a pump. Pumps need to be sized based on pressure, flowrate and head. The oil level is correct when the top gauge is half full. When the new pump also did not build pressure, the manual valve in the outlet line was closed to isolate the pump from the system.
Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge pump not primed verify suction pipe is submerged. Hydraulic pump motor division hydraulic flow is developed as the pump rotating group is driven by a prime mover hydraulic pump basics fluid is forced out of pump at the pump outlet a partial vacuum is created at the pump inlet and atmospheric pressure forces fluid into pump. Troubleshooting and preventive maintenance of hydraulic systems. L2550 hydraulic power steering pump failure, pump opened to show damage. This new format allows the reader to practice disassembly and reassembly of practically any type of mechanical device in a 3d view. Items found in the parts list have been carefully tested and selected by otc. Understanding and troubleshooting wastewater pumping system. Drain the oil and clean the exterior of the pump before making repairs. So, whenever you detect insufficient pressure in a gear pump driven hydraulic system, check the pump body for instant overheating. We will introduce many aspects of troubleshooting hydraulic systems and will share information that will help you to better understand and enhance the operation of your hydraulic equipment. Each piston has a spherical end that mounts in a shoe fig. One cannot estimate the lifetime expectancy of these pumps by simply calculating the lifetime of the ball bearing as no. Listed below are areas that you can diagnose in hydraulic valves.
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